Air-compressor



E. W. YEARSLEY.

AIR COMPRESSOR.

APPLICATION FILED APR.3, 191a Patented Mar. 1, 1921.

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AIR COMPRESSOR.

APPLICATION FILED APR.3,1918.

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UNITED STATES PATENT omen.

EUGENE W. YEARSLEY, 0F BROOKLYN NEW YORK, ASSIGNOR TO THE S. S. WHIT DENTAL MANUFACTURING COMPANY, A CORPO ATION OF PENNSYLVANIA,

AIR-COMPRESSOR.

Specification of Letters Patent.

Patented Mar. 1, 1921.

Application filed April 3, 1918. Serial No. 226,389.

To all whom it may concern:

Be it known that I, EUGENE WV. YEARSLEY, a citizen of the United States, and a resident of Brooklyn, in the county of Kings, State of New York, United States of America, have invented certain new and useful Improvements in Air-Compressors, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to that class of air compressors that are particularly adapted, to the use of dentists, or other such professional operators, and to uses requiring a light compact and noiseless compressor or vacuum producing pump.

The principal objects of my invention are to provide an air compressor that is substantially noiseless in its operation, positive in its action, simple in its construction, and easily accessible for repair.

Another object of my inventionsis to provide an air compressor so constructed and arranged that the piston relieves the valve of the maximum cylinder pressure, and

thereby not only reduces wear, but permits of a lightened construction and consequent quick response of the valve.

Other objects of my. invention are to provide an air compressor with valves so constructed and arranged as to be inexpensive, light, flexible and readily replaced, to provide valves that are delicate but positive in action and that will tend to maintain their seats free from dirt or grit, and to pro vide said valves with seats that are readily removable and interchangeable.

Further objects of my invention are to provide an air compressor that may .be as readily employed as a vacuum producer, and that is so constructed and arranged as to require a minimum clearance, and permit the piston to travel to the end of the cylinder.

Specifically stated, the form of my invention as hereinafter described, co-mprehends an air compressor, provided with a compression cylinder having its exhaust port in its head'and its suction port in its side intermediate of the stroke of the piston, and having replaceable valve seats comprising annular beads in relief, upon which valves,

formed of flexible flat metal plates are floatingly seated, being lightly engaged therewith by dished star-shaped springs, and

limited in their movement by adjusting screws independent thereof.

My lnvention also includes all of the various novel features of construction and arrangement as hereinafter more definitely specified. In the accompanying drawings Figure 1, 1s a vertical transverse sectional view taken centrally through one of the compressor cyllnders; F g. 2, is a fragmentary sectional view of sa1d cylinder, its exhaust valve and yoke, sa1d yoke being shown partly in e evation for convenience of illustration; Fig. 3, 1s a fragmentary sectional view taken transversely of the axis of the cylinder, centrally through the suction valve; Fig. 4:, is a perspective view of the valve seat showingthe annular bead upon which the flexible plate rests; 5, 1s a perspective View of'the valve CllS orplate; and Fig. 6, is a perspectlve v1eW of the star-shaped spring plate which tends to maintain the valve upon 1ts seat.

In said figures, the compressor base 1, is supported upon the reservoir 2, and carries the compressor, comprising the crank casing 3, cylinder 5, head 6, piston 7, pitman 9, crank-pin 10, crank 11, balance-wheel shaft 12 and balance wheel 13. v

The compressor may preferably have a pa1r of cylinders each having an inlet or suction port 15 in the side wall a substantial distance from the exhaust end, and an exhaust port 16 in the cylinder head 6, the suction ports being provided with remov able valve seat bodies 17 having the annu lar valve seat rings or beads 18, and re tamed by theyoke 19 which is detachably engaged by the tap-bolt 20, and the exhaust port being provided with similarly remov able valve seat bodies 21, having the annular valve seat rings or beads 22, and retained by the yoke 23, which is detachably engaged by the tap-bolt 25.

The yoke 19 is provided with the threaded nipple 26, which may be suitably connected with any suitable source of air supply, as for instance, an air washer or strainer, and connects with the air duct 27, leading through said yoke 19, in communication with the chambers 29 and ports 30 in the valve seat bodies 17.

\ The yoke 23 is provided with the threaded nipple 31, arranged to be connected with fitted in the circular valve chamber 38,

which is formed by the annular lip 39 projecting from the side of 'the cyl1nder,'and

said valve is yieldingly held against its seat'" 18 by the star-shaped spring 40, shown "in perspective in Fig. 6. Similarly the exhaust port 16 is controlled by its valve 37 fitted 1n the circular valve chamber 36, by the starshaped spring 40. v p

The valve 37 may have its opening movement adjustably limited by the adjustment of the adjusting screw 41, which is disposed in the yoke 23 in axial alinement with the valve chamber 36, and it is obvious that the movement of the valve' 37 controlling the inlet port 15 may be similarly limited if desired.

The valve seat body 17, is provided in its oppositely directed plane faces with the annular grooves 42 and 43 respectively, the groove 42 being arranged to receive the lip 39 and the groove 43 is arranged to receive the annular lip 45 on the yoke 19, fitted therein and as shown in Fig. 1, the grooves 42 and 43 may be provided with lead washers 46 and 47 respectively, or other suitable leak proof gaskets.

The valve seat body 21, is conveniently provided with the annular projection 49, fitted in the annular groove 50 in the cylinder head 6 in sealed relation by the gasket or washer 51, and said valve seat body 21 is also provided with the peripheral flange 52 fitted into the annular groove 53 in the yoke 23 in sealed relation by the gasket or washer 55.

The valve plate 37 which is best shown in perspective in Fig. 5, is preferablyin the form of a disk of a diameter substantially equal to the diameter of the valve chambers 36 and 38 having four equal and oppositely disposed sectors cut therefrom for the pas sage of air between the chordal edges thereof and the cylindrical walls of said chambers.

It may be here noted that by disposing the inlet ports in the side of the cylinder, spaced from the exhaust end, the valves are not subjected to the severe pressure incident to the final stroke of the piston, for the reason that said piston serves to close these ports at about two-third of its compression stroke, this not only relieves the valves, and permits them to be of light construction, but permits a minimum clearance of the piston, and also renders the compressor capable of being employed as a vacuum pump if desired.

it approaches the maximum compression, so

that up to the time when the piston passes the 1nlet port, the pressure has risen to a comparatively small percentage of themaximum pressure at the termination of the stroke. Upon the return stroke'the vacuum produced by the piston increases only during about one-third of the stroke, and is somewhat reduced by the air trapped in the clearance space, the remaining two-thirds of the stroke of the piston giving ample time for inspiration of the atmospheric air to completely fill the cylinder, thereby, sufi'ering no loss of energy, as in cylinders, wherein the intake ports are located at the initial end of the compression stroke, and wherein the air is taken in in an extremely short space of time.

,[t will be obvious that by the arrangement of the ports thus contemplated, the compressor may be as readily employed as a suction or vacuum pump if desired, which is es ecially advantageous for dental purposes.

y invention is advantageous, in that the valves employed comprise flexible disks that require no machining and may be inserted dislodged by the floating movement of the I valve disk.

My invention is further advantageous in that the valve seat is readily removable and replaceable, and being circular in form can be inexpensively produced on a screw machine, and be held in place by the yoke through the medium of the tap-bolt, which serves to secure said yoke and valve seat bodies to the cylinder body.

I do not desire to limit my invention to the precise details of construction and arrangement as herein set forth, as it is obvious that various modifications may be made thereinwithout departing from the essential features of my invention as defined in the appended claims.

Having thus described. my invention, I claim 1. An air compressor having a compression cylinder provided with an air inlet port in the side thereof and an exhaust port in its head a piston arranged to reciprocate in said cylinder and to close said inlet port as it approaches the end of its compression stroke, valves for said exhaust and inlet ports comprising flexible sheet material and a sprlng bearing against the center of said valve, tending to force it into closed position.

2. An air compressor having a com ression cylinder provided with a valve air inlet port in the side thereof and a valved exhaust port in its'end, a iston arranged to reciprocate in said cylin er and to close said inlet port durin the last half of its compression stroke, t e valve of said air inlet being actuated by the compression in the cylinder.

3. An air compressor having a compression cylinder provided with an inlet port and an exhaust port and a reciprocatory piston operative to close said inlet port as it approximates the termination of its compression stroke, and automatically actuated piston operative to close said inlet port, as

1t approximates the termination of its oom- 'pression stroke, valve seats local to said ports and fluid actuated valves, comprising flat flexible sheet metal disks cooperative with said seats to control said ports.-

6. An air compressor having a com ression cylinder provided with inlet an exhaust ports, removable valve seat bodies comprising beads in relief forming valveseats, and valves having alternate flat and curved sides comprising sheet material fioatingly engaged with said seats.

An air compressor having a compression cylinder provided with ports, remova-ble valve seat bodies forming valve chambers and comprising annular beads in relief affording valve seats, and valves comprising thin sheet material, loosely fitted in said valve seat bodies forming valve chambers for the respective cylinders and comprising annular beads in relief afiording valve seats, and valves comprising thin sheet material, loosely fitted in said chambers, and springs disposed in said chambers tending to hold said valves fioatingly engaged with their respective seats, and a yoke serving as a conduit engaged with the cylinder body arranged to retain said valve seat bodies.

' 9. An air com ressor having compression cylinders provid d with .ports, removable valve seat bodies forming valve chambers for the respective cylinders and comprising annular beads in relief affording valve seats, and valves comprising thin sheet material, loosely fitted in said chambers, and springs disposed in said chambers tending to hold said valves fioatingly engaged with their respective seats; and a yoke serving as a conduit having a plurality of valve chambers arranged to register with the respective valve seat bodies, and having an air ductconnecting said chambers, and means arranged to secure said yoke to the cylinder body and thereby retain said valve seat bodies.

10. An air compressor having a compression cylinder provided with ports having valve seats, comprising an annular head in relief, valves comprising a disk of sheet material fioatingly engaged .with said seats, sheet metal springs tending1 to presssaid valves into engagement wit their respective seats, and means-adjustable to vary the reciprocatory movement of said valves toward and from their respective seats. V

In witness whereof-,1 have hereunto set my hand this. 23 day of March, A. D. 1918.

EUGENE W. YEARSLEY.

Witnesses:-

FREDERICK C. E. PETERSON, JOHN N. Jones. 

